Feed-mill



L. J. CALDWELL.

Feed-Mill.

' No. 225,562. Patentd Mar. 16,1880.

NITJEDY STATES PATENT OFFICE.

LOYD J. OALDVVELL, OF BOURBON, INDIANA.

FEED-MILL.

SPECIFICATION forming part of Letters Patent No. 225,562, dated March16, 1880,

Application filed September 27, 1879. i

To all whom it may concern:

Be it known that I, LOYD JOSEPH CALD- WELL, of Bourbon, in the county ofMarshall and State of Indiana, have invented certain new and usefulImprovementsin Feed-"VIills; and I do hereby declare that the followingis a full, clear, and exact description of the invention, which willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, which form apart of this specification, and in which Figure 1 is a side elevation.Fig. 2 is a longitudinal vertical section. Fig. 3 is a transversehorizontal section through line mm, Fig. 1. Fig. 4 is a side view of thevertically-reciprocating grinding-plate detached from its casing, andFig. 5 is a vertical section through line 3 y in Fig. 1.

Similar letters of reference indicate corresponding parts in all thefigures.

This invention relates to feed mills or grinders of that class in whichthe grinding is performed by a vertically-reciprocatin g shaft workingwithin a vertical casing, said shaft and casin g being provided withgrinding-plates the contiguous faces of which are roughened or serrated;and it consists in the improved construction and combination ofoperating parts, as hereinafter more fully described, and particularlypointed out in the claims.

In the drawings, A is the vertically-reciprocatin g pitman or pump-rodof a windmill,which is inserted into a central enlargement or squaresocket, a, in the grinder-plate B, and secured therein by a detachablebolt, 1). Both faces of the reciprocating grinder-plate B are serratedin lines sloping toward the central longitudinal enlargement, a, atgraduallyincreasing pitch from top to bottom; but the correspondingserrations on opposite sides of the plate alternate with each other,those on one side being half a space ahead or behind their mates on theopposite side, so that when the plate is reciprocated they crush thegrain alternately, and not simultaneously, on both sides of the plate,thus equalizing the strain upon the pumprod or pitman.

The serrations c c on both sides of the grinder-plate point with theiredges in a downward direction, so as to break the whole grain as it isbeing fed into the mill on the downstroke, while the lower serrations, cc c, grind up the broken grain on'its passage between the grinder-plateand contiguous serrated faces of the casing.

The three longitudinal faces upon each side of the central socket orenlargement, a, are serrated, as 'shown at d, uniformly with the restoftheir blade side.

0 O are the serrated casing-plates, which are arranged within a frame,D, provided with setscrews f f at the top and bottom, the inner ends ofwhich bear against plates 0 C, so that by adjusting these screws theplates may be set to grind fine or coarse, as desired.

'Theframe D is bolted upon suitably-arranged braces or supports in themill-tower, and has a hopper, E, at its upper end, inside of which isarranged the vertical adjustable feed-gate F, consisting of two parallelplates united at the top and ends by narrow plates G G, so as to leavean opening at the top for the pitman or pump-rod A to pass through andanother long and narrow slot or opening, 9, at the bottom.

The casing formed by the plates F F G G is inserted vertically betweenuprights h it within the hopper, and is adjustable therein by means ofpins or bolts i, which are inserted through perforations in the uprightsh and perforated ears 70 upon each end of the gate, so that it may beraised or lowered to regulate the rate of grinding, and allows the useof a large hopper full of grain without danger of choking up the mill orgrinder. By withdrawing the bolt 1) the pitman is ungeared from thegrindingplate B, and the grinder will stop operations without in any waydisturbing or interfering with the working of the pumping apparatus.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States 1. In a feed-mill, a flatreciprocating grinding surface or blade, B, provided on both sides withan upper set of corrugations or serrations, c, pointing with theircutting-edges in a downward direction, and a lower set or series ofcorrugations or serrations, c, inclining downwardly from both edgestoward the center at graduallyincreasing pitch from top to bottom,substantially as and for the purpose herein shown and set forth.

2. In a feed-mill, a flat reciprocating grinding surface or blade, B,the inclined corrugations 0 of which are so arranged upon opposite sidesor grindin g-faces of the blade as to break 5 joints or alternate witheach other, the said corrugations or serrations upon each side incliningin a downward direction from both edges toward the center at grad ually-in creasing pitch from top to bottom, substantially as and for thepurpose shown and specified.

3. In a vertical reciprocating feed-mill, the combination of the frameD, adjustable vertical casing-plates O (3, vertical reciprocatinggrinding-blade B, having central socket or enlargement, a, detachablepitman or pump-rod A, hopper E, provided with the perforated uprights hh, and vertical adjustable feed-gate F F G G, having openings at the topand bot-

